This is a new mesh, and means that it's a brand new self contained object that usually does not require a specific Expansion pack (although this is possible depending on the type). It may have Recolours hosted on MTS - check below the description for more information.

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Heterochromia is the condition of having two different colored eyes.
These are accessories for both genders and all age groups except of babies, that cover left or right eye. They are animated and adapt well to most shapes of eyes. You can find them in the glasses section, and they're base game compatible. They can be used with other accessories and glasses because they're layerable.
They come in 13 colors:

They use in-game textures, so there are two things you should know: you need the expansion pack that contains the texture of certain color to be able to see it properly, and if you have default replacement eyes or supernatural skins textures, these accessories will be using them instead of using maxis textures. Of course you may create your own custom colors in Bodyshop.

Polygon counts
Every mesh has 9 faces and 9 vertices.

Known bugs
These accessories sometimes don't adapt well to untypical eye shapes, causing overlap or strange iris deformation. They are also animating in CaS although they shouldn't.